. Elementary and dental radiography / by Howard Riley Raper . Fig. 313. A, B, C, and D, same as in Fig. 311. E, the dotted lines outline the position of apiece of pine wood 1-2 inch thick. teenth inch thick. Lead of this thickness does not totally obstruct verypenetrating X-rays when the tube is brought close up to it, but at theusual distance of several feet between tube and screen it is doubtful ifany X-rays penetrate the latter. The lead glass used in the windows in protection screens and cabinetsis usually one-fourth inch thick. With the tube placed in close proximity 282 DEXTAL RADIOGRAPH
. Elementary and dental radiography / by Howard Riley Raper . Fig. 313. A, B, C, and D, same as in Fig. 311. E, the dotted lines outline the position of apiece of pine wood 1-2 inch thick. teenth inch thick. Lead of this thickness does not totally obstruct verypenetrating X-rays when the tube is brought close up to it, but at theusual distance of several feet between tube and screen it is doubtful ifany X-rays penetrate the latter. The lead glass used in the windows in protection screens and cabinetsis usually one-fourth inch thick. With the tube placed in close proximity 282 DEXTAL RADIOGRAPHY. Fig. 311. Fig. 314. Protective lead 315. Protective lead screen, sectional viev Fig. 315. THE DANGERS OF THE 283
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